Abstract
In this chapter, we discuss technical considerations regarding pulse sequence selection and sequence parameter selection that can affect fMRI studies. The major focus is on optimizing MRI data acquisitions for blood oxygen level-dependent signal detection. Specific recommendations are made for generic 1.5, 3, and 7 T MRI scanners.
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Notes
- 1.
The flip angle can also affect the contrast of the generated images, but for simplicity, we focus here on the more intuitive parameters TE and TR.
- 2.
up to the limits of the gradient hardware and not without various drawbacks.
- 3.
Eddy currents are currents induced in gradient coils and other scanner components from the rapidly changing fields generated by the gradient coils.
- 4.
In addition, a mixed mode EPI has been used in the literature known as ASE, or asymmetric spin echo. This is a SE EPI with the acquisition window shifted to be centered on a time point early on in the SE evolution. The result is an acquisition that has, in a sense, adjustable sensitivity to capillary and venous signal.
- 5.
There are, of course, other parameters that can affect this, such as gradient slew rate, partial fourier and/or field-of-view acquisition, etc.
- 6.
More accurately, retrospective motion correction techniques will be more effective.
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Lowe, M.J., Beall, E.B. (2016). Selection of Optimal Pulse Sequences for fMRI. In: Filippi, M. (eds) fMRI Techniques and Protocols. Neuromethods, vol 119. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-5611-1_3
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